Journal
OPTICS COMMUNICATIONS
Volume 284, Issue 1, Pages 455-459Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2010.09.022
Keywords
Second harmonic generation; Femtosecond; Fiber laser; PPKTP waveguide; Femtosecond laser direct writing
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Funding
- National Natural Science Foundation of China [60677013, 60808003]
- Specialized Research Fund for the Doctoral Program Foundation of Institute of Higher Education of China [20090031120004]
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The frequency doubling of femtosecond pulses from an Yb-doped fiber laser source was demonstrated in a PPKTP waveguide fabricated by femtosecond laser direct writing. The PPKTP waveguide contains a fixed period of 8.9 mu m and the feomtosecond fundamental pulses have a central wavelength of 1044 nm. A maximum SHG power of 406 mW was produced, yielding a conversion efficiency of 5.6%. Numerical simulations were carried out to investigate the property of frequency doubling for femtosecond pulses. The results show that the SHG process proceeds even the quasi-phase-matching (QPM) condition is not well satisfied, which is significantly different from that of long pulses or CW light and is accorded with the experimental results. (C) 2010 Elsevier B.V. All rights reserved.
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